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ConstantFoldLoadThroughGEPConstantExpr wasn't handling pointers to

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packed types correctly.

llvm-svn: 25470
This commit is contained in:
Robert Bocchino 2006-01-19 23:53:23 +00:00
parent d2c0ccedd3
commit 40c6c91f56
1 changed files with 22 additions and 9 deletions
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31
lib/Transforms/Utils/Local.cpp
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@ -267,16 +267,29 @@ Constant *llvm::ConstantFoldLoadThroughGEPConstantExpr(Constant *C,
return 0;
}
} else if (ConstantInt *CI = dyn_cast<ConstantInt>(I.getOperand())) {
const ArrayType *ATy = cast<ArrayType>(*I);
if ((uint64_t)CI->getRawValue() >= ATy->getNumElements()) return 0;
if (ConstantArray *CA = dyn_cast<ConstantArray>(C))
C = CA->getOperand((unsigned)CI->getRawValue());
else if (isa<ConstantAggregateZero>(C))
C = Constant::getNullValue(ATy->getElementType());
else if (isa<UndefValue>(C))
C = UndefValue::get(ATy->getElementType());
else
if (const ArrayType *ATy = dyn_cast<ArrayType>(*I)) {
if ((uint64_t)CI->getRawValue() >= ATy->getNumElements()) return 0;
if (ConstantArray *CA = dyn_cast<ConstantArray>(C))
C = CA->getOperand((unsigned)CI->getRawValue());
else if (isa<ConstantAggregateZero>(C))
C = Constant::getNullValue(ATy->getElementType());
else if (isa<UndefValue>(C))
C = UndefValue::get(ATy->getElementType());
else
return 0;
} else if (const PackedType *PTy = dyn_cast<PackedType>(*I)) {
if ((uint64_t)CI->getRawValue() >= PTy->getNumElements()) return 0;
if (ConstantPacked *CP = dyn_cast<ConstantPacked>(C))
C = CP->getOperand((unsigned)CI->getRawValue());
else if (isa<ConstantAggregateZero>(C))
C = Constant::getNullValue(PTy->getElementType());
else if (isa<UndefValue>(C))
C = UndefValue::get(PTy->getElementType());
else
return 0;
} else {
return 0;
}
} else {
return 0;
}